配置阿里镜像
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
sudo yum clean all
sudo yum makecache
安装
yum -y install centos-release-scl-rh
修改/etc/yum.repos.d/CentOS-SCLo-scl-rh.repo
baseurl=http://vault.centos.org/centos/7/sclo/$basearch/rh/
#mirrorlist=http://mirrorlist.centos.org?arch=$basearch&release=7&repo=sclo-rh
yum -y install devtoolset-11*
激活
echo "source /opt/rh/devtoolset-11/enable" >>/etc/profile
source /etc/profile